Question

what are the solutions of the equation x^2-1=0

Answer 1

\(\bf x^2-1=0\implies x^2=1\implies x=\sqrt{1}\)

Answer 2

(x+1)(x-1)=0
(x+1)=0 (x-1)=0
x=-1 x=1

Answer 3

well... \(\bf x^2-1=0\implies x^2=1\implies x=\pm \sqrt{1}\)